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US National Security Agency (NSA) whistleblower Edward Snowden speaks via live video call during the CeBIT technology fair in Hanover, central Germany, on March 18, 2015. International speakers from business and government discuss the big issues and challenges of the digital world during the fair running until March 20, 2015. China is the CeBIT partner country in 2015. AFP PHOTO / DPA / OLE SPATA +++ GERMANY OUTOle Spata/AFP/Getty Images